Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reclassification from accumulated other comprehensive income (Details)

v3.8.0.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reclassification from accumulated other comprehensive income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]      
Realized and unrealized (gain) loss on investments $ 5,429 $ (20,555) $ (19,305)
Gain on deconsolidation 0 (82,130) 0
Interest expense, net 19,581 52,868 62,129
Net Income (Loss) 42,201 (77,336) (21,554)
Realized and unrealized gain on investments (6,243) (685) 22,264
Total reclassifications (2,345) (471) (30,640)
Net realized (gain) loss on securities | Reclassification from AOCI into net income      
Schedule of Available-for-sale Securities [Line Items]      
Impairment (reversal) 0 54 (31)
Gain on deconsolidation 0 (20,682) 0
Net Income (Loss) (2,345) (451) (32,537)
(Gain) on settlement of real estate securities | Reclassification from AOCI into net income      
Schedule of Available-for-sale Securities [Line Items]      
Realized and unrealized (gain) loss on investments (2,345) (19,129) (42,356)
Loss on settlement of real estate securities | Reclassification from AOCI into net income      
Schedule of Available-for-sale Securities [Line Items]      
Realized and unrealized (gain) loss on investments 0 16,178 9,850
Unrealized loss on real estate securities, intent-to-sell, reclassified from AOCI into income | Reclassification from AOCI into net income      
Schedule of Available-for-sale Securities [Line Items]      
Realized and unrealized (gain) loss on investments 0 23,128 0
Net realized (gain) loss on derivatives designated as cash flow hedges | Reclassification from AOCI into net income      
Schedule of Available-for-sale Securities [Line Items]      
Realized and unrealized (gain) loss on investments 0 0 612
Net Income (Loss) 0 (20) 1,897
Amortization of deferred hedge (gain) | Reclassification from AOCI into net income      
Schedule of Available-for-sale Securities [Line Items]      
Interest expense, net 0 (20) (78)
Loss reclassified from AOCI into income, related to effective portion | Reclassification from AOCI into net income      
Schedule of Available-for-sale Securities [Line Items]      
Interest expense, net $ 0 $ 0 $ 1,363